Claude p



Jan. 15, 1924.'

C. P. MCNEIL COATlNG GRANULES origina1 Filed Ap'ril 21, 1919 PatentedJan. 15,1924.

. A,UNITI-:D STATES MTENTv OFFICE.. l

CLAUDE P.' MoNEIL, OLE WHITING, INDIANA, ASSIGNOR T0 SECRETARY OF `TAR`THE UNITED STATES 0F AMERICA, TRUSTEE.

'coA'rING GRANULES.

Original application filled April 21, 1919, SeriallNo. 291.585. Divided'and this application filed January 16, 1922. Serial No. 529,789. l y

(FILED Umbra 'run Acr or MARCH a. 1833, 22 strani., 625.)

cers or employees, in prosecution of Work a l for the Government, or byany other person in the United States, Without payment of.'

any royalty thereon.- y Y This application is a division of `myapplication'Serial No. 291,585, iiled April 21,

This invention relates to the spraying of granules and has for itsobject the production of a granule which is uniformly coated over itsentire surface. In order to carry Y .20 the objects of my inventionvinto effect, I

provide a process .wherein chemicals .inl solution and liquids aresprayed over-the granlules.

My invention has been successfully applied to thel coating of soda-limewith sodium permanganate. Permanganate coated soda-lime has been founduseful for the absorption of certain gases used in Warl fare' andencountered'in the industries, such as arsine, pho'sgene, and otherchlorinated organic compounds, C()2 gas and the like. Formerly, thesodium permanganate solution Was incorporated in the granulel during theprocess vof formation of the same but, since the yield, of granules ofthe required size is only about of thetotal Weight of impregnatedsoda-lime, 60% of the permananate used was lost together with'the re-]ected lines.` The permanganate is comparatively expensive While theother ingredients are comparatively cheap, hence, the building up of thegranule Without the permanganate and adding the permanganateafter .thefineshave been removed, effects a great saving in permanganate. Thisprocedure may be applied to a variety of substances and has been adaptedto the spraying of' soda-lime granules with Iperlnanganate, navy,soda-lime with Water, in the application of various not pile up at andehyde, caustic soda, etc., to charcoal granules, and many others.

A typical form. of apparatus used inthe process 1s dlsclosed in theaccompanying drawing wherein:

Fig. 1 is a plan view of the preferred form of my apparatus, parts ofthe device being shown broken in order to illustrate interior portionsof same.

Fig. 2 is a side elevation. l f

The apparatus consists of a cylinder or drum (1) constituting therevolving spraying chamber and provided with stationary hoods (2) `and(3) at each end'. A ,feed hopper (4) 1s provided at one end of the cyl--inder to which is attached ay chute (5) leading through the hood (2)into/the spra in chamber (1). The chute (5) mayy bi equipped withsliding gates for controlling the ovv of the granules Which are fed fromtheliopper g4) into the spraying chamber (l). TheA en of the chute- (5)is iitted with a fan-shaped distributor, shown at 6) for spreading thegranules so that they Will n point. The spraying uid is supplied from asuitablev source through the supply pipe (7) to the'tank (8) fromv whichit 1s drawn through the pipes (9) and ('10) -and deliveredvthrough thespray nozzles or atomizers (11) and (12) intofthe spraying chamber (1).Compressed air or other gas may be supplied through the pipe (13) to thetank (8) in order to aid theforcing of the spraying iuid out from thetank (8)- through the nozzles (11)- and (12).

The cylinder or drum is preferably inclined as, shown in Fig.` 2, theportion of the cylinder Where the granules enter same being higher thanthe discharge end. Rotary motion 1s imparted to the cylinder (l) bymeans of the-motor (14), belt (l5), v'shaft (16)", gears (17)', andracks (18). As this cylinder revolves the hoods (2) and (3) re-.

main stationary. The granules Within the .cylinder are tumbled andagitated by thev revolution of the cylinder (1) and the agiesl tationmay be increased by providing the interior of the cylinder (1) withbaffle plates no chemicals such as copper sulphate, fo'rmal- (19). ,Asthe cylinder (1) rotates the gran- 10u a ules gravitate toward thedischarge end and pass into the hopper (20) A plurality of atomizers areusually'provvided at each end of the cylinder, and they are so mountedthatV they can be directed into the chamber at any angle, thus givingcon-v siderable flexibility in operation. As the cylinder (1) revolvesthe granules are tumbled and rolled over and some are dropped throughthe spray. It Will be seen that the .granules as they are Jfed from thehopper through the chute (5)4 into the spraying chamber (l) pass throughthe jets of spraying Huid issuing from, lthe nozzles (l1). Thisfacilitates the uniform spraying of the granules.

The process consists essentially in exposing the granules to an atomizedspray of the liquid by both Y dropping the granules through a spray andspraying the liquid directly upon' the granules which are being;agitated in a suitable tumbling mechanism;-

The operation is continuous and the resulting product is uniformlycoated due to the agitation and consequent exposure of all the of anoxidizing salt;

surfaces vof the granulesfto the vliquid spray which is in such a finelydivided state' that it vvis practically vaporized.

The present invention is not limited to the specific details set fort-l1in the foregoing trative and not by Way of' limitation, and

'in view of the numerous modifications which may be ei'ected thereinWithout departing from the spirit and scope of this inventiom.

2. In a process of coating soda-lime granules, passing said granulesthrough a spray of permanganate and agit'ating said granules in a sprayof permanganate.

CLAUDE i?. MCNEIL.

a 'spray of a solution Y 3u lexamples, which should be construed asillus-

